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Alemtuzumab Fab 1CE1.png
Monoclonal antibody
TypeWhole antibody
SourceHumanized (from rat)
Trade namesCampath, Mabcampath, Lemtrada, others
Clinical data
Main usesChronic lymphocytic leukemia (CLL), multiple sclerosis[1]
Side effectsLow blood cells, infusion reactions, infection, nausea, diarrhea, trouble sleeping[2]
  • AU: B3(Lemtrada); B2 (Mabcampath)
Routes of
Intravenous infusion
External links
License data
Legal status
  • AU: S4 (Prescription only)
  • UK: POM (Prescription only)
  • US: ℞-only
  • EU: Rx-only
Elimination half-life~288 hrs
Chemical and physical data
Molar mass145454.20 g·mol−1

Alemtuzumab, sold under the brand names Campath and Lemtrada among others, is a medication used to treat chronic lymphocytic leukemia (CLL) and multiple sclerosis.[1] In CLL, it has been used as both a first line and second line treatment.[1] In MS it is generally only recommended if other treatments have not worked.[1] It is given by injection into a vein or under the skin.[1]

Common side effects include low blood cells, infusion reactions, infection, nausea, diarrhea, and trouble sleeping.[2] People taking the medication should not get live vaccines.[2] Use in pregnancy may harm the baby.[2] It is a monoclonal antibody that binds to CD52, a protein present on lymphocytes, resulting in their destruction.[3]

Alemtuzumab was approved for medical use in the United States and Europe in 2001.[1][4] The brand approved for CLL in Europe; however, was withdrawn while a new brand was approved for MS.[4][3] In the United Kingdom a via of 12 mg costs the NHS about £7,000 as of 2021.[5] This amount in the United States is about 27,700 USD.[6]

Medical uses

a) Sezary syndrome prior to treatment b) after 13 months treatment

Chronic lymphocytic leukemia

Alemtuzumab is used for the treatment of B-cell chronic lymphocytic leukemia (B-CLL) in people who have been treated with alkylating agents and who have failed fludarabine therapy. It is an unconjugated antibody, thought to work via the activation of antibody-dependent cell-mediated cytotoxicity (ADCC).[7]

Multiple sclerosis

It is used for the relapsing remitting form of multiple sclerosis.[1] A 2017 Cochrane meta-analysis of studies comparing alemtuzumab to interferon beta 1a concluded that annual cycles of alemtuzumab probably reduces the proportion of people that experience relapse and may reduce the proportion of people who experience disability worsening and new T2 lesions on MRI, with adverse events found to be similarly high for both treatments.[8] However the low-to-moderate levels of evidence in the included, existing studies were noted and the need for larger high-quality randomised, double‐blind, controlled trials comparing mono or combination therapy with alemtuzumab was highlighted.[8] It is generally only recommended in people do not respond sufficiently to at least two other MS medications.[1]


Alemtuzumab is contraindicated in patients who have active infections, underlying immunodeficiency (e.g., seropositive for HIV), or known type I hypersensitivity or anaphylactic reactions to the substance.[9]

Side effects

In November 2018, the US Food and Drug Administration (FDA) issued a Safety Announcement[10] warning about rare but serious instances of stroke and blood vessel wall tears in multiple sclerosis patients who have received Lemtrada (alemtuzumab), mostly occurring within 1 day of initiating treatment and leading in some cases to permanent disability and even death.

In addition to the 13 cases to which the FDA Safety Announcement refers, a further 5 cases of spontaneous intracranial haemorrhage have been retrospectively identified from four US multiple sclerosis centres in correspondence published online in February 2019.[11]

On 12 April 2019, the Pharmacovigilance Risk Assessment Committee Archived 2021-10-11 at the Wayback Machine (PRAC) of the European Medicines Agency (EMA) reported that it has started a review of the multiple sclerosis medicine Lemtrada (alemtuzumab) following new reports of immune-mediated conditions and of problems with the heart and blood vessels with this medicine, including fatal cases. PRAC advised that while the review is ongoing, Lemtrada should only be started in adults with relapsing-remitting multiple sclerosis that is highly active despite treatment with at least two disease-modifying therapies (a type of multiple sclerosis medicine) or where other disease-modifying therapies cannot be used. PRAC further advised that patients being treated with Lemtrada who are benefitting from it may continue treatment in consultation with their doctor.[12]

Very common adverse reactions associated with alemtuzumab infusion in MS patients include upper respiratory tract and urinary tract infections, herpes virus infections, lymphopenia, leucopenia, changes in thyroid function, tachycardia, skin rashes, pruritus, pyrexia, and fatigue.[13] The Summary of Product Characteristics provided in the electronic Medicines Compendium [eMC [14]] further lists common and uncommon adverse reactions that have been reported for Lemtrada, which include serious opportunistic nocardial infections and cytomegalovirus syndrome.[15][16][17]

Alemtuzumab can also precipitate autoimmune disease through the suppression of regulatory T cell populations and/or the emergence of autoreactive B-cells.[18][19]

Cases of multiple sclerosis reactivation/relapse have also been reported[20]


Alemtuzumab is a recombinant DNA-derived humanized IgG1 kappa monoclonal antibody that is directed against the 21–28 kDa cell surface glycoprotein CD52.[21]

Antiviral properties

In an in-vitro experiment, it has been shown that alemtuzumab has antiviral properties against HIV-1.[22]


The origins of alemtuzumab date back to Campath-1 which was derived from the rat antibodies raised against human lymphocyte proteins by Herman Waldmann and colleagues in 1983.[23] The name "Campath" derives from the pathology department of Cambridge University.

Initially, Campath-1 was not ideal for therapy because patients could, in theory, react against the foreign rat protein determinants of the antibody. To circumvent this problem, Greg Winter and his colleagues humanised Campath-1, by extracting the hypervariable loops that had specificity for CD52 and grafting them onto a human antibody framework. This became known as Campath-1H and serves as the basis for alemtuzumab.[24]

While alemtuzumab started life as a laboratory tool for understanding the immune system, within a short time it was clinically investigated for use to improve the success of bone marrow transplants and as a treatment for leukaemia, lymphoma, vasculitis, organ transplants, rheumatoid arthritis and multiple sclerosis.[25]

Campath as medication was first approved for B-cell chronic lymphocytic leukemia in 2001. It is marketed by Genzyme, which acquired the worldwide rights from Bayer AG in 2009. Genzyme was bought by Sanofi in 2011. In August/September 2012 Campath was withdrawn from the markets in the US and Europe. This was done to prevent off-label use of the drug to treat multiple sclerosis and to prepare for a relaunch under the trade name Lemtrada, with a different dosage aimed at multiple sclerosis treatment, this is expected to be much higher-priced.[26]

Bayer reserves the right to co-promote Lemtrada for 5 years, with the option to renew for an additional five years.

Sanofi acquisition

In February 2011, Sanofi-Aventis, since renamed Sanofi, acquired Genzyme, the manufacturer of alemtuzumab.[27] The acquisition was delayed by a dispute between the two companies regarding the value of alemtuzumab. The dispute was settled by the issuance of Contingent Value Rights, a type of stock warrant which pays a dividend only if alemtuzumab reaches certain sales targets. The contingent value rights (CVR) trade on the NASDAQ-GM market with the ticker symbol GCVRZ.

In August 2012, Genzyme surrendered the licence for all presentations of alemtuzumab,[28] pending regulatory approval to re-introduce it as a treatment for multiple sclerosis. Concerns[29] that Genzyme would later bring to market the same product at a much higher price proved correct.

(Mab)Campath was withdrawn from the markets in the US and Europe in 2012, to prepare for a higher-priced relaunch of Lemtrada aimed at multiple sclerosis.[26]


Graft-versus-host disease

A 2009 retrospective study of alemtuzumab (10 mg IV weekly) in 20 patients (no controls) with severe steroid-resistant acute intestinal graft-versus-host disease after allogeneic hematopoietic stem cell transplantation (HSCT) demonstrated improvement. Overall response rate was 70%, with complete response in 35%.[30] In this study, the median survival was 280 days. Important complications following this treatment included cytomegalovirus reactivation, bacterial infection, and invasive aspergillosis infection.[30]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "Alemtuzumab Monograph for Professionals". American Society of Health-System Pharmacists. Archived from the original on 28 January 2012. Retrieved 15 July 2019.
  2. 2.0 2.1 2.2 2.3 "DailyMed - CAMPATH- alemtuzumab injection". Archived from the original on 25 March 2021. Retrieved 13 January 2022.
  3. 3.0 3.1 "Lemtrada". Archived from the original on 29 June 2021. Retrieved 13 January 2022.
  4. 4.0 4.1 "MabCampath". Archived from the original on 14 January 2022. Retrieved 13 January 2022.
  5. BNF 81: March-September 2021. BMJ Group and the Pharmaceutical Press. 2021. p. 904. ISBN 978-0857114105.
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  8. 8.0 8.1 Zhang, Jian; Shi, Shengliang; Zhang, Yueling; Luo, Jiefeng; Xiao, Yousheng; Meng, Lian; Yang, Xiaobo (27 November 2017). "Alemtuzumab versus interferon beta 1a for relapsing-remitting multiple sclerosis". The Cochrane Database of Systematic Reviews. 11: CD010968. doi:10.1002/14651858.CD010968.pub2. ISSN 1469-493X. PMC 6486233. PMID 29178444.
  9. "LEMTRADA® (alemtuzumab) injection, for intravenous use Prescribing Information". Archived from the original on 27 October 2021. Retrieved 11 October 2021.
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External links

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